I want to edit an issue type scheme for a project in our data center instance, where the issue types Operation Task, Story, and Support all get converted to Task. As of now, there's 454 Operation Task issues, 1300 Support issues, and 11000 Story issues for this project. So when I try mapping any of the three to the Task issue type, I'm always met with a 504 gateway error.
Is there a better way of migrating these issues, or is there a way to set the proxy timeout longer than what it is already (seems to timeout after 30ish seconds)?